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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6510d7c4dd592bc675ce7b4463f7087ad09d1705be067a4eee0428b8d2d8bca9' 
  AND token = 'f6SblHks8khlepUe6nLaK45ZoBrr4AWwcFLcjgXkSbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}